Collapsible background screen



FIG. 1 is a front view of a collapsible background screen showing my newdesign;

FIG. 2 is a side view thereof;

FIG. 3 is a rear view;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The ornamental design for a collapsible background screen, as shown.